Weather History for Dulles Airport, VA

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Saturday, December 15, 2012

  Actual Average Record
Temperature  
Mean Temperature 41 °F 36 °F  
Max Temperature 53 °F 46 °F 71 °F (1971)
Min Temperature 28 °F 27 °F 5 °F (1989)
Degree Days  
Heating Degree Days 24 29  
Month to date heating degree days 291 397  
Since 1 July heating degree days 1270 1313  
Cooling Degree Days 0 0  
Month to date cooling degree days 0 0  
Year to date cooling degree days 1436 1178  
Moisture  
Dew Point 29 °F    
Average Humidity 67    
Maximum Humidity 92    
Minimum Humidity 42    
Precipitation  
Precipitation T in 0.09 in 1.07 in (2005)
Month to date precipitation 0.20 1.58  
Year to date precipitation 32.95 40.16  
Snow  
Snow 0.00 in 0.10 in 4.70 in (1981)
Month to date snowfall 0.0 1.5  
Since 1 July snowfall T 2.0  
Snow Depth 0.00 in    
Sea Level Pressure  
Sea Level Pressure 30.22 in    
Wind  
Wind Speed 3 mph (SE)    
Max Wind Speed 10 mph    
Max Gust Speed 29 mph    
Visibility 10 miles    
Events      
T = Trace of Precipitation, MM = Missing Value Source: NWS Daily Summary

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Daily Weather History Graph

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Date:

Astronomy

Dec. 15, 2012 Rise Set
Actual Time 7:21 AM EST 4:48 PM EST
Civil Twilight 6:51 AM EST 5:18 PM EST
Nautical Twilight 6:18 AM EST 5:52 PM EST
Astronomical Twilight 5:45 AM EST 6:24 PM EST
Moon 9:13 AM EST (12/15) 7:49 PM EST (12/15)
Length of Visible Light 10h 27m
Length of Day
9h 27m
Waxing Crescent, 8% of the Moon is Illuminated
Dec 15
Waxing Crescent
Dec 20
First Quarter
Dec 28
Full
Jan 4
Last Quarter
Jan 11
New

Hourly Weather History & Observations

Time (EST) Temp. Windchill Dew Point Humidity Pressure Visibility Wind Dir Wind Speed Gust Speed Precip Events Conditions
12:52 AM 30.0 °F - 26.1 °F 85% 30.26 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
1:52 AM 30.9 °F - 26.1 °F 82% 30.25 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
2:52 AM 30.9 °F - 25.0 °F 79% 30.26 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
3:52 AM 30.9 °F - 26.1 °F 82% 30.25 in 10.0 mi Calm Calm - N/A   Overcast
4:52 AM 28.9 °F - 26.1 °F 89% 30.26 in 10.0 mi Calm Calm - N/A   Overcast
5:52 AM 30.9 °F - 27.0 °F 85% 30.26 in 10.0 mi Calm Calm - N/A   Overcast
6:52 AM 30.0 °F - 25.0 °F 82% 30.28 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
7:52 AM 30.9 °F - 27.0 °F 85% 30.29 in 10.0 mi Calm Calm - N/A   Overcast
8:52 AM 35.1 °F 31.0 °F 28.0 °F 76% 30.31 in 10.0 mi North 4.6 mph - N/A   Mostly Cloudy
9:52 AM 39.0 °F 36.8 °F 30.0 °F 70% 30.30 in 10.0 mi NW 3.5 mph - N/A   Mostly Cloudy
10:52 AM 41.0 °F - 30.9 °F 67% 30.28 in 10.0 mi Calm Calm - N/A   Mostly Cloudy
11:52 AM 41.0 °F 39.0 °F 32.0 °F 70% 30.26 in 10.0 mi NW 3.5 mph - N/A   Mostly Cloudy
12:52 PM 50.0 °F - 30.0 °F 46% 30.24 in 10.0 mi Calm Calm - N/A   Scattered Clouds
1:52 PM 52.0 °F - 30.0 °F 43% 30.21 in 10.0 mi SE 9.2 mph - N/A   Scattered Clouds
2:52 PM 51.1 °F - 30.9 °F 46% 30.19 in 10.0 mi SE 3.5 mph - N/A   Mostly Cloudy
3:52 PM 51.1 °F - 30.0 °F 44% 30.17 in 10.0 mi SE 6.9 mph - N/A   Mostly Cloudy
4:52 PM 50.0 °F - 28.9 °F 44% 30.17 in 10.0 mi SE 6.9 mph - N/A   Mostly Cloudy
5:52 PM 48.0 °F - 30.0 °F 50% 30.17 in 10.0 mi SE 4.6 mph - N/A   Overcast
6:52 PM 48.9 °F - 30.0 °F 48% 30.18 in 10.0 mi SSE 5.8 mph - N/A   Overcast
7:52 PM 48.0 °F - 32.0 °F 54% 30.14 in 10.0 mi SE 6.9 mph - N/A   Overcast
8:52 PM 46.9 °F - 32.0 °F 56% 30.14 in 10.0 mi SSE 8.1 mph - N/A   Overcast
9:52 PM 46.9 °F - 32.0 °F 56% 30.14 in 10.0 mi SSE 4.6 mph - N/A   Overcast
10:52 PM 46.0 °F 42.5 °F 34.0 °F 63% 30.13 in 10.0 mi SSE 6.9 mph - 0.00 in   Overcast
11:52 PM 46.0 °F 43.9 °F 36.0 °F 68% 30.14 in 10.0 mi SSE 4.6 mph - 0.00 in   Overcast